664  
CDUS41 KLWX 120525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT MON APR 12 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR APRIL 11 2021
 
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
CLIMATE RECORD PERIOD: 1960 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 79 2:57 PM 87 1977 65 14 63  
MINIMUM 60 12:18 AM 25 1960 41 19 34  
1970  
1971  
AVERAGE 70 53 17 49  
 
PRECIPITATION (IN)  
YESTERDAY 0.13 0.74 2009 0.12 0.01 0.00  
MONTH TO DATE 1.03 1.33 -0.30 0.48  
SINCE MAR 1 3.30 4.71 -1.41 2.47  
SINCE JAN 1 9.46 10.13 -0.67 9.04  
 
SNOWFALL (IN)  
YESTERDAY 0.0 T 1973 0.0 0.0 0.0  
1986  
MONTH TO DATE T 0.2 -0.2 0.0  
SINCE MAR 1 T 3.0 -3.0 T  
SINCE JUL 1 12.0 21.9 -9.9 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 12 -12 16  
MONTH TO DATE 114 154 -40 119  
SINCE MAR 1 629 801 -172 567  
SINCE JUL 1 3822 4391 -569 3711  
 
COOLING  
YESTERDAY 5 0 5 0  
MONTH TO DATE 5 0 5 0  
SINCE MAR 1 9 3 6 3  
SINCE JAN 1 9 3 6 3    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 21 HIGHEST WIND DIRECTION W (260)  
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION W (250)  
AVERAGE WIND SPEED 8.5  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 3:00 AM  
LOWEST 29 2:00 PM  
AVERAGE 63  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 66 87 1977  
MINIMUM TEMPERATURE (F) 41 23 1982  
 
SUNRISE AND SUNSET  
APRIL 12 2021.........SUNRISE 6:37 AM EDT SUNSET 7:44 PM EDT  
APRIL 13 2021.........SUNRISE 6:36 AM EDT SUNSET 7:45 PM EDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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